Details

Autor(en) / Beteiligte

• Hu, Kangkai
• E, Lei
• Hu, Chaoyang
• Zhao, Dan
• Zhu, Mengyao
• Wang, Jingze
• Zhao, Wei

Titel

g-CN/TiO composite microspheres: growth and high visible light catalytic activity

Ist Teil von

• CrystEngComm, 2020-11, Vol.22 (42), p.714-7112

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The morphology, structure and composition of a photocatalyst are the key factors affecting its photocatalytic activity. Herein, g-C 3 N 4 nanosheets were successfully grown in situ on the surface of TiO 2 microspheres, and then a three-dimensional (3D) flower-like g-C 3 N 4 /TiO 2 composite microsphere photocatalyst (FCTM) was formed with the self-assembly of TiO 2 nanosheets. The effects of g-C 3 N 4 nanosheets on the growth process, physical adsorption and photocatalytic activity of FCTM samples were studied. Compared with pure TiO 2 , the 3D flower-like g-C 3 N 4 /TiO 2 composite microsphere photocatalyst had a larger specific surface area, and the specific surface area of FCTM-20 was 239.75 m 2 g −1 . Additionally, the addition of g-C 3 N 4 nanosheets also changed the surface charge of TiO 2 microspheres, resulting in the improvement of the physical adsorption capacity of FCTM-20. The degradation rates with FCTM-20 of MO and MB solutions were 51.7% and 92.5% after visible light irradiation for 5 h, which were 41.6% and 111.2% higher than those with pure TiO 2 microspheres, respectively. During the photocatalytic process, FCTM-20 exhibited the best adsorption and degradation of MB solution. This is because the chromophoric groups of MO and MB lead to different energy requirements for FCTM-20 in the degradation process. Furthermore, the self-assembled 3D flower-like morphology of FCTM-20 provided more active sites for the degradation of MO and MB, and the heterojunction structure formed between TiO 2 and g-C 3 N 4 was more conducive to the transmission of photogenerated carriers. The g-C 3 N 4 /TiO 2 heterojunction, possessing a 3D flower-like self-assembled morphology, realizing excellent visible-light photocatalytic properties, is a photocatalyst for wastewater treatment or a photoanode for photoelectrochemical water splitting.